Not really, they still used pretty much the same method - collapsing a portal/multiple portals with a large amount of energy. Ner'zhul did it accidentally, and Illidan then copied what he did intentionally.
The point remains the same, Illidan did not use his own power, at all. Dont take me wrong, he is a powerhouse, but that same result couldve been archieved by many other characters in his position, as far as we know.